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The Prognostic Role of STAT5B Across Cancer Types and Comparative Analysis with STAT5A: A Systematic Review
Christine Maninang1, Jinghong Li1, Willis X Li1
1Department of Medicine, University of California, La Jolla, San Diego, CA 92037, USA.
Biomolecules
|November 27, 2025
Summary
High signal transducer and activator of transcription 5B (STAT5B) expression correlates with better overall survival in many cancers, suggesting a tumor-suppressive role. This contrasts with STAT5A, highlighting the importance of isoform-specific evaluation for cancer prognosis.
Area of Science:
- Oncology
- Molecular Biology
- Bioinformatics
Background:
- Signal transducer and activator of transcription 5 (STAT5) proteins, including STAT5A and STAT5B, are crucial transcription factors in cellular processes.
- STAT5A's role in tumor progression is context-dependent, while STAT5B's prognostic significance in cancer is less understood.
Purpose of the Study:
- To systematically evaluate the association between STAT5B expression and overall survival across various cancer types using meta-analysis.
- To compare the prognostic role of STAT5B with that of STAT5A in cancer.
Main Methods:
- Analysis of microarray datasets from the Prognoscan database for STAT5B expression and overall survival.
- Meta-analysis of 42 datasets using Cox proportional hazards models to estimate hazard ratios.
- Subgroup analyses were conducted by cancer type, with heterogeneity assessed using Cochran's Q Test and I-squared statistics.
Main Results:
- High STAT5B expression was significantly linked to favorable overall survival (lnHR = -0.4009, p < 0.0001), despite considerable heterogeneity (I² = 64%).
- STAT5B showed a protective effect in lung cancers (lnHR = -0.5170, p = 0.0042) and hematologic malignancies (lnHR = -0.6988, p < 0.0001).
- STAT5A exhibited differential effects, associated with favorable survival in breast cancer but poorer outcomes in hematologic cancers.
Conclusions:
- Elevated STAT5B expression is associated with improved survival across multiple cancers, indicating a distinct tumor-suppressive function compared to STAT5A.
- Isoform-specific evaluation of STAT5 is critical for accurate cancer prognosis.
- STAT5B may represent a valuable biomarker and a potential therapeutic target in oncology.
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